Antenna



FIG. 1 is a front elevational view of an antenna showing my new design, the rear elevational view being a mirror image thereof, the figure being broken away to indicate indeterminate length;

FIG. 2 is a front elevational view of an upper portion of the antenna shown at an enlarged scale; and,

FIG. 3 is a top plan view thereof. 

The ornamental design for an antenna, as shown and described. 